RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Realgar. Realgar is an orange-red, arsenic sulphide mineral, from which a large proportion of the world's arsenic is derived. Realgar is highly poisonous and has been used throughout history as both a pigment and a medicine.
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